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Finding the Fourth Proportional to 361.15, 540.81 and 214.81

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Solution

The fourth proportional to 361.15, 540.81 and 214.81 is: 321.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.15 : 540.81 = 214.81 : x
  2. Step 2: Convert to fraction form
    361.15/540.81 = 214.81/x
  3. Step 3: Cross multiply
    361.15x = 540.81 × 214.81
  4. Step 4: Simplify right side
    361.15x = 116,170.04
  5. Step 5: Solve for x
    x = 116,170.04/361.15
  6. Step 6: Final answer
    x = 321.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.